1/3+1/15+1/35+······+1/9999和是多少?
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1/3+1/15+1/35+······+1/9999和是多少?
1/3+1/15+1/35+······+1/9999和是多少?
1/3+1/15+1/35+······+1/9999和是多少?
1/3+1/15+1/35+······+1/9999
=1/3+1/2{(1/3-1/5)+(1/5-1/7)+...(1/99-1/101)}
=1/3+1/2(1/3-1/101)
=1/3+49/303
=52/303
1/3+1/15+1/35+······+1/9999和
1/3+1/15+1/35+······+1/9999和是多少?
1 2 3 4 ·····7 ·······10 ········?1 3 5 7 ·····?······?··········290 1 4 9 ·····?······?··········?
急·····················1+2+3+...+999=?
计算1/(1*4)+1/(4*7)+1/(7*10)+------+1/(97*100)································································································
计算:3/1+8/1+15/1+·······+360/1
1+2++3+··········+10000=
8+11+14+17+20+·······+305 数学计算题.呜呜呜1+2+3+4+···················+98+99+100+99+98+···············+3+2+1
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